Year	Percent
1950	12.64205
1955	12.40285
1960	13.93282
1965	14.17205
1970	15.02803
1975	16.41294
1980	16.78582
1985	15.96643
1990	14.42985
1995	13.32056
2000	11.36684
2005	9.86273
2010	9.19003
2015	9.42455
2020	9.25161
2025	8.20494
2030	7.30311
2035	6.56924
2040	6.12693
2045	5.94852
2050	5.86837
2055	5.7163
2060	5.47083
2065	5.22088
2070	5.06781
2075	5.02333
2080	5.03865
2085	5.04103
2090	4.99165
2095	4.90331
2100	4.83598