Year	Percent
1950	12.28169
1955	12.83078
1960	16.31438
1965	16.05391
1970	15.79345
1975	15.62277
1980	16.06582
1985	16.16295
1990	15.80237
1995	14.71268
2000	13.10013
2005	13.21915
2010	11.89467
2015	13.02791
2020	11.28148
2025	9.60384
2030	9.15984
2035	8.58305
2040	8.1902
2045	7.76077
2050	7.17695
2055	6.60852
2060	6.16616
2065	5.87071
2070	5.66046
2075	5.46702
2080	5.26221
2085	5.0615
2090	4.89498
2095	4.79138
2100	4.73284