Year	Percent
1950	12.50234
1955	11.93207
1960	11.86309
1965	12.70896
1970	12.95561
1975	12.97571
1980	12.81045
1985	12.96095
1990	12.81861
1995	11.83032
2000	11.727
2005	12.61919
2010	12.39144
2015	10.58169
2020	9.67806
2025	9.15422
2030	8.93287
2035	8.45294
2040	7.83394
2045	7.20567
2050	6.67708
2055	6.3081
2060	6.04965
2065	5.80705
2070	5.54984
2075	5.29726
2080	5.10738
2085	4.9886
2090	4.92827
2095	4.88444
2100	4.8385