Jahr X1 X2 X3 X4 
1920 87.9 19.6 1.0 1661
1921 89.9 15.2 90.1 968
1922 153.0 19.7 56.6 1353
1923 132.1 17.0 91.0 1293
1924 88.8 18.3 93.7 1153
1925 220.9 17.8 106.9 1286
1926 117.7 17.8 65.5 1104
1927 109.0 18.3 41.8 1574
1928 156.1 17.8 57.4 1222
1929 181.5 16.8 140.6 902
1930 181.4 17.0 74.3 1150