Year Number
1950 81.056
1951 78.449
1952 76.062
1953 73.691
1954 71.502
1955 69.666
1956 69.335
1957 69.023
1958 68.865
1959 69.005
1960 69.515
1961 71.8
1962 73.979
1963 76.151
1964 78.343
1965 80.475
1966 83.714
1967 86.939
1968 89.986
1969 92.582
1970 94.609
1971 95.425
1972 95.478
1973 94.946
1974 94.054
1975 92.954
1976 93.12
1977 92.875
1978 92.433
1979 92.106
1980 92.085
1981 92.397
1982 93.186
1983 94.209
1984 95.094
1985 95.694
1986 97.81
1987 99.171
1988 100.029
1989 100.698
1990 101.227
1991 101.438
1992 101.438
1993 101.041
1994 99.957
1995 98.064
1996 95.11
1997 91.689
1998 87.893
1999 83.92
2000 79.924
2001 75.701
2002 71.705
2003 67.95
2004 64.456
2005 61.264
2006 58.526
2007 56.055
2008 53.89
2009 52.07
2010 50.604
2011 49.534
2012 48.709
2013 48.128
2014 47.728
2015 47.449
2016 47.364
2017 47.265
2018 47.173
2019 47.118
2020 47.089
2021 46.868
2022 46.709
2023 46.529
2024 46.227
2025 45.764
2026 45.159
2027 44.447
2028 43.671
2029 42.906
2030 42.206
2031 41.556
2032 40.982
2033 40.497
2034 40.12
2035 39.86
2036 39.716
2037 39.698
2038 39.812
2039 40.049
2040 40.406
2041 40.853
2042 41.389
2043 42.062
2044 42.925
2045 43.999
2046 45.182
2047 46.543
2048 48.064
2049 49.709
2050 51.444
2051 53.128
2052 54.886
2053 56.681
2054 58.457
2055 60.177
2056 61.665
2057 63.081
2058 64.402
2059 65.591
2060 66.629
2061 67.332
2062 67.886
2063 68.327
2064 68.709
2065 69.073
2066 69.237
2067 69.393
2068 69.58
2069 69.862
2070 70.277
2071 70.627
2072 71.097
2073 71.727
2074 72.543
2075 73.54
2076 74.475
2077 75.612
2078 76.889
2079 78.214
2080 79.511
2081 80.579
2082 81.649
2083 82.681
2084 83.638
2085 84.496
2086 85.049
2087 85.521
2088 85.899
2089 86.19
2090 86.41
2091 86.347
2092 86.222
2093 86.07
2094 85.934
2095 85.842
2096 85.496
2097 85.209
2098 85.002
2099 84.896
2100 84.895