Year Number
1950 77.18
1951 79.645
1952 82.755
1953 85.669
1954 87.861
1955 89.272
1956 91.515
1957 92.691
1958 93.268
1959 93.681
1960 94.044
1961 94.99
1962 96.025
1963 96.802
1964 96.898
1965 96.26
1966 97.154
1967 97.253
1968 96.799
1969 96.054
1970 94.98
1971 93.337
1972 91.418
1973 89.22
1974 86.852
1975 84.475
1976 81.542
1977 79.062
1978 76.83
1979 74.625
1980 72.412
1981 69.69
1982 67.243
1983 65.146
1984 63.547
1985 62.436
1986 61.107
1987 60.078
1988 59.225
1989 58.392
1990 57.538
1991 57.303
1992 56.889
1993 56.39
1994 55.949
1995 55.622
1996 55.361
1997 55.238
1998 55.132
1999 54.921
2000 54.567
2001 54.228
2002 53.787
2003 53.236
2004 52.598
2005 51.921
2006 51.887
2007 51.784
2008 51.631
2009 51.503
2010 51.454
2011 51.199
2012 51.119
2013 51.136
2014 51.174
2015 51.236
2016 51.331
2017 51.475
2018 51.651
2019 51.872
2020 52.166
2021 52.51
2022 52.901
2023 53.377
2024 53.985
2025 54.753
2026 55.608
2027 56.612
2028 57.737
2029 58.957
2030 60.25
2031 61.538
2032 62.899
2033 64.27
2034 65.565
2035 66.739
2036 67.644
2037 68.417
2038 69.071
2039 69.655
2040 70.205
2041 70.542
2042 70.847
2043 71.111
2044 71.321
2045 71.467
2046 71.356
2047 71.226
2048 71.091
2049 70.994
2050 70.986
2051 70.878
2052 70.878
2053 70.979
2054 71.161
2055 71.403
2056 71.499
2057 71.699
2058 71.987
2059 72.341
2060 72.753
2061 73.048
2062 73.443
2063 73.922
2064 74.51
2065 75.243
2066 75.921
2067 76.746
2068 77.7
2069 78.733
2070 79.796
2071 80.617
2072 81.482
2073 82.363
2074 83.248
2075 84.152
2076 84.779
2077 85.418
2078 86.09
2079 86.807
2080 87.561
2081 87.996
2082 88.505
2083 89.061
2084 89.647
2085 90.272
2086 90.592
2087 90.984
2088 91.441
2089 91.966
2090 92.567
2091 92.842
2092 93.207
2093 93.665
2094 94.203
2095 94.807
2096 95.032
2097 95.377
2098 95.816
2099 96.304
2100 96.821