Year	Percent
1950	13.68843
1955	15.5756
1960	16.55054
1965	17.53795
1970	18.25289
1975	18.64965
1980	19.10618
1985	19.29057
1990	19.20261
1995	18.77494
2000	18.2971
2005	17.65535
2010	17.31781
2015	16.75273
2020	15.99299
2025	15.31169
2030	14.65525
2035	14.01176
2040	13.39407
2045	12.77959
2050	12.18937
2055	11.65838
2060	11.15861
2065	10.71072
2070	10.26313
2075	9.85256
2080	9.46204
2085	9.10844
2090	8.76387
2095	8.43016
2100	8.12534