1910    12.840
1911     8.800
1912    15.600
1913    18.380
1914    18.700
1915    15.880
1916    12.520
1917    23.280
1918    27.240
1919     3.180
1920    15.360
1921    39.820
1922    19.640
1923    23.340
1924    34.460
1925    20.020
1926    35.720
1927    36.140
1928    16.640
1929    19.300
1930     7.120
1931    35.100
1932    17.240
1933    12.100
1934    28.400
1935    14.660
1936    17.560
1937     4.900
1938    24.080
1939    14.860
1940    32.320
1941    29.400
1942    14.940
1943    21.060
1944    12.920
1945    23.380
1946    31.740
1947    40.400
1948     5.660
1949     3.020
1950    27.820
1951    13.160
1952     7.760
1953    10.460
1954    21.300
1955    20.200
1956    19.220
1957     6.040
1958    12.660
1959     3.580
1960    43.980
1961    19.300
1962     4.380
1963    13.300
1964    23.920
1965     4.160
1966     9.580
1967     7.820
1968     5.600
1969    15.760
1970    10.320
1971    26.420
1972     3.420
1973    36.940
1974    21.800
1975    15.760
1976     7.660
1977    49.840
1978    11.600
1979    11.800
1980     8.480
1981     5.820
1982     3.460
1983    34.740
1984    40.700
1985    35.020
1986    22.100
1987    24.880
1988    21.320
1989    10.260
1990    15.180
1991    41.980
1992     9.740
1993    20.280
1994    25.160
1995    14.440
1996    32.180
1997    22.520
1998    23.480
1999     6.860
2000    22.620
2001     6.500
2002    21.740
2003     9.500
2004    40.320
2005    10.120
2006    14.480
2007    37.420
2008    27.100
2009    19.740
2010    40.000
2011    29.540
2012    49.140