Year	Percent
1950	19.5371
1955	21.09349
1960	19.64073
1965	19.8334
1970	20.94178
1975	21.22332
1980	23.10555
1985	21.41504
1990	20.51912
1995	22.23509
2000	24.30503
2005	26.80257
2010	27.85184
2015	26.81794
2020	26.8665
2025	28.18707
2030	33.14773
2035	35.5761
2040	34.88598
2045	31.71614
2050	27.13909
2055	25.18228
2060	25.09694
2065	25.6519
2070	25.22582
2075	24.07088
2080	23.42686
2085	23.43371
2090	23.76839
2095	24.09302
2100	24.06994