Year	Percent
1950	10.84374
1955	9.89261
1960	9.4595
1965	9.67346
1970	10.97608
1975	10.76733
1980	10.45769
1985	10.53951
1990	10.90611
1995	11.24701
2000	11.24207
2005	10.77115
2010	11.04825
2015	10.87793
2020	10.49633
2025	9.44576
2030	8.96784
2035	8.66187
2040	8.29559
2045	7.87735
2050	7.44232
2055	7.04573
2060	6.69212
2065	6.38976
2070	6.12703
2075	5.90228
2080	5.68863
2085	5.50728
2090	5.35001
2095	5.22791
2100	5.12187