Year	Percent
1950	13.54964
1955	13.58037
1960	13.41366
1965	13.27937
1970	12.88443
1975	13.13991
1980	13.62535
1985	14.2181
1990	15.02597
1995	16.12118
2000	17.02868
2005	18.06281
2010	19.2915
2015	20.37258
2020	21.42033
2025	22.20282
2030	23.3237
2035	25.20188
2040	26.96416
2045	27.62458
2050	27.41299
2055	26.17563
2060	24.94235
2065	24.60938
2070	24.38895
2075	23.986
2080	23.21979
2085	22.45829
2090	21.94161
2095	21.68303
2100	21.54951