Year	Percent
1950	9.35787
1955	7.37703
1960	9.67671
1965	11.03897
1970	10.83346
1975	8.17967
1980	7.12808
1985	7.68585
1990	8.47016
1995	8.75227
2000	7.59436
2005	6.62869
2010	5.30055
2015	4.67838
2020	5.27135
2025	5.07551
2030	4.6728
2035	4.30642
2040	4.08642
2045	3.99254
2050	4.10767
2055	4.26441
2060	4.28848
2065	4.20292
2070	4.14416
2075	4.17276
2080	4.30288
2085	4.46752
2090	4.56813
2095	4.57439
2100	4.52535