Year Number
1950 52.7
1951 52.95
1952 53.042
1953 53.237
1954 53.511
1955 53.772
1956 53.952
1957 54.231
1958 54.532
1959 54.771
1960 54.894
1961 54.743
1962 54.589
1963 54.379
1964 54.076
1965 53.683
1966 53.489
1967 52.961
1968 52.295
1969 51.754
1970 51.473
1971 51.529
1972 51.89
1973 52.415
1974 52.879
1975 53.166
1976 53.52
1977 53.704
1978 53.737
1979 53.606
1980 53.29
1981 52.618
1982 51.538
1983 50.207
1984 48.891
1985 47.769
1986 47.148
1987 46.811
1988 46.593
1989 46.262
1990 45.71
1991 45.586
1992 45.243
1993 44.763
1994 44.288
1995 43.911
1996 43.536
1997 43.294
1998 43.129
1999 42.94
2000 42.68
2001 42.517
2002 42.262
2003 41.998
2004 41.848
2005 41.88
2006 42.046
2007 42.43
2008 42.968
2009 43.544
2010 44.11
2011 44.987
2012 45.766
2013 46.545
2014 47.495
2015 48.705
2016 50.069
2017 51.703
2018 53.48
2019 55.212
2020 56.775
2021 58.119
2022 59.341
2023 60.44
2024 61.44
2025 62.359
2026 63.225
2027 63.994
2028 64.699
2029 65.406
2030 66.165
2031 66.897
2032 67.717
2033 68.602
2034 69.486
2035 70.331
2036 71.045
2037 71.744
2038 72.478
2039 73.354
2040 74.456
2041 75.646
2042 77.03
2043 78.595
2044 80.25
2045 81.889
2046 83.312
2047 84.744
2048 86.128
2049 87.411
2050 88.582
2051 89.489
2052 90.297
2053 90.965
2054 91.431
2055 91.649
2056 91.406
2057 90.96
2058 90.356
2059 89.658
2060 88.909
2061 87.913
2062 86.956
2063 86.017
2064 85.081
2065 84.169
2066 83.099
2067 82.094
2068 81.231
2069 80.575
2070 80.131
2071 79.669
2072 79.477
2073 79.501
2074 79.674
2075 79.973
2076 80.243
2077 80.68
2078 81.249
2079 81.884
2080 82.529
2081 82.976
2082 83.452
2083 83.926
2084 84.389
2085 84.845
2086 85.054
2087 85.255
2088 85.455
2089 85.653
2090 85.832
2091 85.692
2092 85.565
2093 85.45
2094 85.355
2095 85.296
2096 84.969
2097 84.701
2098 84.521
2099 84.454
2100 84.508