Year	Percent
1950	12.8181
1955	11.5455
1960	9.8453
1965	8.89103
1970	8.44362
1975	8.63096
1980	8.25234
1985	8.46579
1990	11.92008
1995	13.38252
2000	15.58731
2005	15.46093
2010	15.71933
2015	16.74179
2020	17.91851
2025	19.47491
2030	20.32731
2035	21.41397
2040	22.37457
2045	23.27486
2050	24.7074
2055	25.9098
2060	26.21428
2065	26.01873
2070	27.00282
2075	28.84743
2080	30.17235
2085	30.94318
2090	31.36881
2095	31.77616
2100	32.35192