Year	Percent
1950	8.48497
1955	9.11576
1960	8.8283
1965	9.30381
1970	12.25056
1975	11.7849
1980	11.37676
1985	11.62562
1990	13.57306
1995	13.85799
2000	14.07208
2005	14.93512
2010	16.08645
2015	17.70893
2020	19.79172
2025	21.97243
2030	24.07214
2035	26.04226
2040	28.29414
2045	30.55218
2050	32.70077
2055	34.5486
2060	36.12387
2065	37.27091
2070	38.05873
2075	38.61326
2080	38.88648
2085	38.87101
2090	38.7947
2095	38.79127
2100	38.90989