Year	Percent
1950	13.83827
1955	12.45609
1960	15.84121
1965	16.38609
1970	15.25061
1975	14.92129
1980	15.30499
1985	15.36552
1990	15.21095
1995	14.22195
2000	12.93408
2005	11.62381
2010	10.42696
2015	9.73159
2020	8.90267
2025	8.16207
2030	7.43992
2035	6.82388
2040	6.31457
2045	5.91584
2050	5.58088
2055	5.29228
2060	5.0486
2065	4.83633
2070	4.67992
2075	4.56354
2080	4.47665
2085	4.41961
2090	4.37123
2095	4.33378
2100	4.30559