Year	Percent
1950	9.52404
1955	9.83613
1960	11.25462
1965	12.693
1970	13.69098
1975	14.04262
1980	12.64279
1985	12.6218
1990	15.67856
1995	17.75325
2000	19.2686
2005	20.80358
2010	22.15647
2015	25.13495
2020	27.79802
2025	30.28353
2030	32.6545
2035	34.63237
2040	36.87108
2045	38.42917
2050	39.10176
2055	38.63114
2060	37.68231
2065	36.6719
2070	36.45713
2075	36.6019
2080	36.71796
2085	36.75644
2090	36.76546
2095	36.89345
2100	37.2509