Year	Percent
1950	14.0602
1955	13.88868
1960	13.59729
1965	13.2181
1970	12.47618
1975	11.39401
1980	10.3077
1985	9.51693
1990	9.25078
1995	11.41322
2000	11.30319
2005	11.08796
2010	10.80216
2015	11.10398
2020	12.43076
2025	14.37162
2030	16.90924
2035	19.50563
2040	21.01912
2045	22.13489
2050	23.061
2055	24.03124
2060	25.31357
2065	26.48524
2070	27.309
2075	27.73588
2080	27.99397
2085	28.1702
2090	28.25603
2095	28.16333
2100	27.88767