Year	Percent
1950	13.77834
1955	15.00819
1960	14.76719
1965	14.23671
1970	13.43657
1975	11.83309
1980	10.70053
1985	10.47471
1990	10.45433
1995	9.4929
2000	8.39115
2005	7.53859
2010	7.09641
2015	6.54795
2020	6.20134
2025	5.88583
2030	5.58262
2035	5.30027
2040	5.07692
2045	4.92502
2050	4.80717
2055	4.72179
2060	4.64513
2065	4.5789
2070	4.51793
2075	4.48626
2080	4.46741
2085	4.46093
2090	4.45979
2095	4.44626
2100	4.43611