1910    37.320
1911    22.620
1912    46.960
1913    31.760
1914    30.660
1915    37.520
1916    31.100
1917    27.560
1918    14.520
1919    35.400
1920    32.900
1921    29.040
1922    22.680
1923    28.960
1924    26.940
1925     9.420
1926    15.160
1927    11.900
1928    11.800
1929    21.800
1930    16.320
1931    18.460
1932    27.880
1933    14.420
1934    51.480
1935    16.220
1936     8.820
1937    14.960
1938     9.100
1939    14.440
1940    13.540
1941    43.660
1942    19.580
1943    11.240
1944    16.820
1945     9.600
1946     4.560
1947    14.460
1948    16.060
1949    15.100
1950    21.240
1951    13.500
1952     6.740
1953    14.100
1954    29.160
1955    20.820
1956    33.640
1957    20.680
1958    13.940
1959    10.440
1960    10.140
1961    11.560
1962     3.980
1963    11.100
1964    25.320
1965    22.520
1966    11.600
1967    10.000
1968     8.680
1969     5.700
1970     9.020
1971    12.480
1972     8.540
1973    13.800
1974     6.360
1975    21.400
1976     9.480
1977     9.640
1978    13.820
1979    13.800
1980    12.520
1981    26.620
1982    18.580
1983    31.300
1984    29.740
1985    20.980
1986    25.400
1987    17.320
1988    10.780
1989    32.400
1990    15.000
1991    10.680
1992    23.000
1993    24.380
1994    19.000
1995    14.560
1996    29.460
1997    20.140
1998    21.960
1999    22.580
2000    40.560
2001    22.780
2002    34.240
2003    52.040
2004     7.960
2005    28.320
2006    27.400
2007    36.280
2008    15.580
2009    10.780
2010    14.840
2011    23.700
2012    56.480