Year	Percent
1950	12.09487
1955	11.04431
1960	10.38345
1965	12.88559
1970	12.96906
1975	12.61017
1980	12.28348
1985	12.41892
1990	13.08045
1995	13.26405
2000	12.07787
2005	11.37561
2010	10.51444
2015	9.60132
2020	9.35647
2025	9.54464
2030	8.95111
2035	8.28533
2040	7.68267
2045	7.23956
2050	6.93767
2055	6.69867
2060	6.44779
2065	6.17849
2070	5.93224
2075	5.73878
2080	5.60681
2085	5.51408
2090	5.43389
2095	5.34253
2100	5.25243