Year	Percent
1950	11.83515
1955	10.33645
1960	9.91066
1965	12.54812
1970	13.31558
1975	13.64426
1980	12.92414
1985	12.0391
1990	11.9867
1995	12.17294
2000	11.12673
2005	10.33061
2010	8.94426
2015	8.38267
2020	8.16754
2025	8.44664
2030	7.84749
2035	7.22425
2040	6.68443
2045	6.30756
2050	6.0862
2055	5.93371
2060	5.75785
2065	5.53772
2070	5.31659
2075	5.14481
2080	5.03837
2085	4.97445
2090	4.91532
2095	4.83401
2100	4.74353