diff -r f64255a88d66 -r 27a25f32048e src/main/java/de/uapcore/lightpit/entities/VersionStatistics.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/de/uapcore/lightpit/entities/VersionStatistics.java	Sun May 24 15:30:43 2020 +0200
@@ -0,0 +1,101 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2018 Mike Becker. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+package de.uapcore.lightpit.entities;
+
+public class VersionStatistics {
+
+    private final Version version;
+    private int[][] issueCount;
+
+    private int[] rowTotals = null;
+    private int[] columnTotals = null;
+    private int total = -1;
+
+    public VersionStatistics(Version version) {
+        this.version = version;
+        issueCount = new int[IssueCategory.values().length][IssueStatus.values().length];
+    }
+
+    public Version getVersion() {
+        return version;
+    }
+
+    public void setIssueCount(IssueCategory category, IssueStatus status, int count) {
+        issueCount[category.ordinal()][status.ordinal()] = count;
+        total = -1;
+        rowTotals = columnTotals = null;
+    }
+
+    public int[][] getIssueCount() {
+        return issueCount;
+    }
+
+    public int[] getRowTotals() {
+        if (rowTotals != null) return rowTotals;
+        final int cn = IssueCategory.values().length;
+        final int sn = IssueStatus.values().length;
+        final var totals = new int[cn];
+        for (int i = 0 ; i < cn ; i++) {
+            totals[i] = 0;
+            for (int j = 0 ; j < sn ; j++) {
+                totals[i] += issueCount[i][j];
+            }
+        }
+        return rowTotals = totals;
+    }
+
+    public int[] getColumnTotals() {
+        if (columnTotals != null) return columnTotals;
+        final int cn = IssueCategory.values().length;
+        final int sn = IssueStatus.values().length;
+        final var totals = new int[sn];
+        for (int i = 0 ; i < sn ; i++) {
+            totals[i] = 0;
+            for (int j = 0 ; j < cn ; j++) {
+                totals[i] += issueCount[j][i];
+            }
+        }
+        return columnTotals = totals;
+    }
+
+    public int getTotal() {
+        if (this.total >= 0) {
+            return this.total;
+        }
+        int total = 0;
+        final int cn = IssueCategory.values().length;
+        final int sn = IssueStatus.values().length;
+        for (int i = 0 ; i < sn ; i++) {
+            for (int j = 0 ; j < cn ; j++) {
+                total += issueCount[j][i];
+            }
+        }
+        return this.total = total;
+    }
+}