Year	Percent
1950	7.98374
1955	10.50588
1960	10.80233
1965	12.25418
1970	12.22817
1975	12.74922
1980	13.58334
1985	12.96068
1990	13.2172
1995	13.48231
2000	13.39554
2005	11.42958
2010	11.55479
2015	11.98009
2020	12.41477
2025	11.17969
2030	10.20747
2035	9.65172
2040	9.33043
2045	9.04762
2050	8.67052
2055	8.20509
2060	7.69998
2065	7.25075
2070	6.8865
2075	6.57045
2080	6.28231
2085	5.99127
2090	5.71306
2095	5.46597
2100	5.26295