Year	Percent
1950	17.84708
1955	20.71821
1960	19.57867
1965	20.01213
1970	18.50317
1975	17.01243
1980	15.08151
1985	14.29575
1990	13.98184
1995	14.73318
2000	14.58326
2005	13.98397
2010	13.80083
2015	12.43044
2020	11.21541
2025	10.79031
2030	10.70819
2035	10.70045
2040	10.40004
2045	9.74546
2050	8.96731
2055	8.36426
2060	8.07586
2065	7.91629
2070	7.66879
2075	7.2312
2080	6.70959
2085	6.24575
2090	5.9504
2095	5.7703
2100	5.61804