1910    19.200
1911    14.280
1912    20.300
1913    11.580
1914    16.740
1915    22.020
1916    14.340
1917    11.560
1918    21.220
1919     7.280
1920    21.360
1921    29.220
1922    21.020
1923    13.380
1924    26.180
1925    23.140
1926    41.840
1927    26.720
1928    15.340
1929    37.760
1930     8.500
1931    43.920
1932    16.780
1933     6.840
1934    12.680
1935    26.300
1936    16.800
1937     6.540
1938    26.680
1939     3.240
1940    21.120
1941    28.240
1942    19.700
1943     6.600
1944    13.880
1945    41.820
1946    17.660
1947    16.180
1948    31.080
1949     6.980
1950     6.500
1951     7.820
1952     6.060
1953    10.780
1954     3.760
1955    40.620
1956    10.400
1957     9.480
1958    35.340
1959    11.140
1960    52.220
1961    18.100
1962     5.760
1963    12.960
1964    23.400
1965    10.540
1966    13.600
1967    21.380
1968     2.420
1969    25.940
1970     5.980
1971    37.760
1972     7.340
1973    30.600
1974     8.660
1975    23.660
1976    15.100
1977    26.500
1978    11.500
1979    15.800
1980    26.900
1981    15.120
1982     3.820
1983    43.160
1984    33.520
1985    21.160
1986    26.860
1987     9.260
1988    12.240
1989    10.200
1990    14.600
1991    41.620
1992    11.760
1993    29.160
1994    12.960
1995    17.660
1996    16.060
1997     9.720
1998    27.740
1999     7.860
2000    21.360
2001    13.020
2002    21.660
2003    39.640
2004    29.420
2005    16.500
2006    13.760
2007    37.720
2008    10.160
2009    11.900
2010    15.180
2011    23.040
2012    54.840
2013    29.820