Year	Percent
1950	15.94528
1955	18.14114
1960	17.99652
1965	17.69101
1970	17.38829
1975	16.5957
1980	15.50663
1985	14.66759
1990	14.0462
1995	13.12494
2000	12.2292
2005	11.25917
2010	10.77137
2015	10.20726
2020	9.54042
2025	8.89515
2030	8.30294
2035	7.78254
2040	7.32192
2045	6.90612
2050	6.53228
2055	6.19443
2060	5.90278
2065	5.65432
2070	5.44464
2075	5.2737
2080	5.12724
2085	5.00408
2090	4.90033
2095	4.81543
2100	4.75488