Year	Percent
1950	10.07604
1955	10.19179
1960	9.94333
1965	9.49971
1970	9.0544
1975	9.1589
1980	10.94756
1985	11.14328
1990	10.79699
1995	11.02763
2000	11.14228
2005	10.83194
2010	10.38704
2015	10.13653
2020	9.66798
2025	8.79794
2030	8.18214
2035	7.73448
2040	7.25896
2045	6.7868
2050	6.33894
2055	5.97214
2060	5.71157
2065	5.50222
2070	5.32534
2075	5.18079
2080	5.06581
2085	4.98804
2090	4.93381
2095	4.90208
2100	4.88557