Year	Percent
1950	13.68517
1955	14.77233
1960	14.41533
1965	13.7899
1970	13.12611
1975	12.34224
1980	11.41981
1985	12.04633
1990	13.4934
1995	14.4217
2000	16.00854
2005	19.17747
2010	23.64201
2015	25.54486
2020	26.88354
2025	27.52908
2030	27.85758
2035	29.83194
2040	31.13392
2045	30.97428
2050	29.85759
2055	27.41157
2060	25.35165
2065	24.35342
2070	24.2295
2075	23.92697
2080	23.43815
2085	22.95685
2090	22.62497
2095	22.51439
2100	22.58416