Year	Percent
1950	15.54581
1955	15.53498
1960	15.53653
1965	15.42053
1970	13.76964
1975	13.91652
1980	13.7969
1985	12.15388
1990	10.4658
1995	9.55967
2000	9.84755
2005	10.83799
2010	11.74066
2015	12.4944
2020	14.19002
2025	14.55535
2030	15.75409
2035	16.27624
2040	16.31488
2045	17.6881
2050	18.72232
2055	20.03806
2060	20.95552
2065	21.39616
2070	21.76437
2075	22.17194
2080	22.65937
2085	23.10237
2090	23.42765
2095	23.65541
2100	23.82564