Year	Percent
1950	9.44811
1955	12.76029
1960	13.5494
1965	13.77469
1970	13.22719
1975	13.17492
1980	12.05652
1985	11.50572
1990	11.40863
1995	11.56252
2000	12.34466
2005	11.658
2010	11.58975
2015	11.29153
2020	10.44903
2025	9.68357
2030	9.24337
2035	9.02544
2040	8.81972
2045	8.54243
2050	8.17928
2055	7.80102
2060	7.47641
2065	7.23391
2070	7.03733
2075	6.82101
2080	6.57316
2085	6.31502
2090	6.08839
2095	5.89075
2100	5.73274