Year	Percent
1950	11.83626
1955	12.59014
1960	14.04907
1965	15.62836
1970	17.11548
1975	18.6123
1980	16.70203
1985	18.07068
1990	21.92235
1995	22.80576
2000	23.67641
2005	25.03104
2010	25.83915
2015	28.87799
2020	30.73397
2025	31.13976
2030	32.14516
2035	34.1581
2040	36.59172
2045	37.39196
2050	37.9744
2055	39.05078
2060	38.9856
2065	38.64249
2070	38.44386
2075	38.04967
2080	37.84985
2085	37.82135
2090	37.89136
2095	37.97274
2100	38.10801