Year	Percent
1950	15.0192
1955	16.90292
1960	16.95803
1965	16.98261
1970	17.27582
1975	18.32545
1980	18.98129
1985	19.35326
1990	19.72538
1995	20.0881
2000	20.18939
2005	19.95033
2010	19.29735
2015	18.56355
2020	17.76359
2025	16.9133
2030	16.01214
2035	15.09197
2040	14.20403
2045	13.35282
2050	12.56067
2055	11.83539
2060	11.18301
2065	10.58543
2070	10.03541
2075	9.51814
2080	9.05169
2085	8.61773
2090	8.21471
2095	7.8579
2100	7.52018