Year Number
1950 77.846
1951 77.3
1952 75.397
1953 73.062
1954 71.03
1955 69.661
1956 68.936
1957 68.927
1958 69.395
1959 69.87
1960 69.909
1961 72.453
1962 73.69
1963 73.725
1964 73.175
1965 72.659
1966 72.988
1967 73.505
1968 74.344
1969 75.3
1970 76.227
1971 79.588
1972 81.803
1973 83.066
1974 83.778
1975 84.275
1976 86.101
1977 88.077
1978 90.044
1979 91.583
1980 92.509
1981 95.13
1982 96.421
1983 96.844
1984 97.002
1985 97.223
1986 97.159
1987 97.017
1988 96.832
1989 96.39
1990 95.526
1991 96.899
1992 97.741
1993 98.023
1994 97.844
1995 97.337
1996 97.368
1997 96.951
1998 96.233
1999 95.382
2000 94.548
2001 94.852
2002 94.96
2003 94.964
2004 94.924
2005 94.861
2006 95.354
2007 95.701
2008 95.873
2009 95.839
2010 95.618
2011 95.687
2012 95.546
2013 95.228
2014 94.759
2015 94.168
2016 94.025
2017 93.603
2018 92.978
2019 92.249
2020 91.469
2021 90.9
2022 90.267
2023 89.535
2024 88.652
2025 87.617
2026 86.859
2027 85.905
2028 84.827
2029 83.716
2030 82.627
2031 81.833
2032 80.998
2033 80.113
2034 79.154
2035 78.121
2036 77.294
2037 76.362
2038 75.367
2039 74.357
2040 73.362
2041 72.598
2042 71.795
2043 70.954
2044 70.072
2045 69.155
2046 68.413
2047 67.606
2048 66.746
2049 65.848
2050 64.926
2051 64.16
2052 63.348
2053 62.504
2054 61.643
2055 60.778
2056 60.075
2057 59.344
2058 58.599
2059 57.856
2060 57.127
2061 56.561
2062 55.981
2063 55.398
2064 54.821
2065 54.26
2066 53.844
2067 53.422
2068 53
2069 52.581
2070 52.171
2071 51.896
2072 51.605
2073 51.308
2074 51.02
2075 50.751
2076 50.604
2077 50.45
2078 50.29
2079 50.124
2080 49.956
2081 49.883
2082 49.788
2083 49.678
2084 49.563
2085 49.45
2086 49.433
2087 49.395
2088 49.344
2089 49.289
2090 49.239
2091 49.282
2092 49.308
2093 49.325
2094 49.337
2095 49.351
2096 49.466
2097 49.561
2098 49.644
2099 49.722
2100 49.804