Year	Percent
1950	13.40854
1955	14.32105
1960	13.27006
1965	13.49791
1970	14.41318
1975	16.20446
1980	16.05355
1985	17.0308
1990	17.35221
1995	16.76232
2000	16.91341
2005	15.08167
2010	14.10707
2015	13.60811
2020	13.26226
2025	12.44817
2030	11.53408
2035	10.69279
2040	9.96455
2045	9.3123
2050	8.71667
2055	8.16319
2060	7.61252
2065	7.12329
2070	6.72282
2075	6.3948
2080	6.13957
2085	5.94106
2090	5.77957
2095	5.64758
2100	5.54182