Year	Percent
1950	15.41387
1955	16.89379
1960	16.95776
1965	17.16284
1970	17.60068
1975	18.10941
1980	18.48865
1985	18.74852
1990	19.20303
1995	19.24953
2000	19.29117
2005	19.6574
2010	19.79908
2015	19.07869
2020	18.07048
2025	17.31395
2030	16.60265
2035	15.77832
2040	14.84763
2045	13.89508
2050	12.99314
2055	12.19322
2060	11.4569
2065	10.79952
2070	10.17385
2075	9.58418
2080	9.0512
2085	8.55733
2090	8.12556
2095	7.74913
2100	7.40769