Year	Percent
1950	13.56372
1955	13.76976
1960	13.45927
1965	13.29406
1970	13.57547
1975	14.1116
1980	14.71158
1985	15.28501
1990	16.3037
1995	17.38802
2000	19.42016
2005	21.96266
2010	23.62976
2015	24.50089
2020	25.03984
2025	25.5919
2030	26.46021
2035	27.56064
2040	27.86226
2045	27.0151
2050	25.94665
2055	24.8851
2060	24.04915
2065	23.64145
2070	23.10447
2075	22.61482
2080	22.17863
2085	21.90412
2090	21.74528
2095	21.64707
2100	21.54904