Year	Percent
1950	12.50328
1955	12.41888
1960	13.99246
1965	13.90644
1970	13.72414
1975	13.51041
1980	13.67804
1985	13.5007
1990	13.27621
1995	12.22189
2000	11.10259
2005	10.45867
2010	10.06173
2015	9.72967
2020	9.60523
2025	9.10754
2030	8.57812
2035	8.08952
2040	7.70341
2045	7.41402
2050	7.15309
2055	6.87402
2060	6.59673
2065	6.34091
2070	6.14124
2075	5.98557
2080	5.84773
2085	5.7258
2090	5.60541
2095	5.49875
2100	5.4146