Year	Percent
1950	14.2738
1955	14.02819
1960	13.7628
1965	13.49947
1970	13.24414
1975	13.00797
1980	12.60738
1985	11.70129
1990	11.9489
1995	12.03168
2000	11.73996
2005	11.32164
2010	11.20519
2015	11.53787
2020	12.4153
2025	13.6549
2030	14.95128
2035	16.6387
2040	18.79915
2045	21.17563
2050	23.64885
2055	25.26077
2060	26.2671
2065	26.70058
2070	26.77682
2075	27.03375
2080	27.11209
2085	27.06664
2090	26.84347
2095	26.48452
2100	26.06094