Year	Percent
1950	17.06117
1955	17.20778
1960	17.86318
1965	18.41873
1970	18.51041
1975	18.80713
1980	18.45761
1985	17.85479
1990	16.59292
1995	15.52737
2000	15.26616
2005	13.7421
2010	13.14503
2015	13.37031
2020	12.91454
2025	12.08541
2030	11.23128
2035	10.60455
2040	10.08073
2045	9.56588
2050	9.01239
2055	8.49246
2060	8.02412
2065	7.60355
2070	7.26659
2075	6.97416
2080	6.70389
2085	6.4645
2090	6.24882
2095	6.06752
2100	5.91278