Year	Percent
1950	13.01208
1955	12.89231
1960	14.0186
1965	14.06836
1970	14.02643
1975	14.17513
1980	14.94174
1985	15.2204
1990	15.41315
1995	14.83069
2000	14.37823
2005	13.87733
2010	13.67354
2015	13.90594
2020	13.93987
2025	13.17148
2030	12.4595
2035	11.90775
2040	11.50409
2045	11.1468
2050	10.75216
2055	10.31624
2060	9.85853
2065	9.43122
2070	9.06216
2075	8.73375
2080	8.40563
2085	8.08148
2090	7.76396
2095	7.44047
2100	7.15423