Year	Percent
1950	14.15389
1955	16.26122
1960	16.15486
1965	15.92619
1970	15.49053
1975	15.13854
1980	14.75258
1985	14.65832
1990	13.95515
1995	13.06806
2000	12.2824
2005	11.51274
2010	10.60314
2015	9.41761
2020	8.89013
2025	8.37103
2030	7.87634
2035	7.34722
2040	6.84456
2045	6.46268
2050	6.20348
2055	5.98709
2060	5.7815
2065	5.59652
2070	5.44038
2075	5.32119
2080	5.23622
2085	5.17239
2090	5.10428
2095	5.03876
2100	4.98376