Year	Percent
1950	15.81487
1955	18.62345
1960	18.71326
1965	18.99134
1970	18.50561
1975	18.46996
1980	18.24435
1985	17.25544
1990	15.4143
1995	12.91949
2000	9.90208
2005	8.90597
2010	10.68785
2015	11.6966
2020	10.12263
2025	8.66962
2030	7.54532
2035	6.98687
2040	6.90282
2045	6.96384
2050	6.84203
2055	6.40596
2060	5.88363
2065	5.54739
2070	5.43919
2075	5.45641
2080	5.45087
2085	5.33839
2090	5.14419
2095	4.96529
2100	4.87274