Year	Percent
1950	12.71807
1955	11.74953
1960	12.71354
1965	14.0859
1970	14.29893
1975	14.21487
1980	13.7055
1985	13.04617
1990	12.38049
1995	11.17511
2000	10.25469
2005	10.04358
2010	9.80009
2015	9.16144
2020	8.98703
2025	8.31882
2030	7.78553
2035	7.39057
2040	7.11587
2045	6.88489
2050	6.64764
2055	6.41462
2060	6.19936
2065	6.02738
2070	5.89583
2075	5.79768
2080	5.69617
2085	5.59869
2090	5.50786
2095	5.4293
2100	5.36985