Year	Percent
1950	12.32881
1955	12.16222
1960	11.70994
1965	11.47055
1970	11.90885
1975	12.26504
1980	12.96339
1985	13.62361
1990	16.7157
1995	16.71536
2000	17.02974
2005	17.45161
2010	19.25624
2015	20.8875
2020	23.09157
2025	25.5454
2030	27.51371
2035	29.11433
2040	29.6635
2045	30.2516
2050	31.03193
2055	31.96468
2060	32.61102
2065	33.07431
2070	33.93602
2075	34.7932
2080	35.63086
2085	36.38249
2090	37.04262
2095	37.63686
2100	38.21962