Year	Percent
1950	10.29612
1955	10.07767
1960	9.74631
1965	9.89155
1970	10.33485
1975	10.42443
1980	10.97102
1985	11.13721
1990	10.87456
1995	10.92804
2000	10.40061
2005	10.40926
2010	9.91468
2015	9.09079
2020	8.60725
2025	8.30906
2030	8.19984
2035	7.7839
2040	7.33791
2045	6.92783
2050	6.59141
2055	6.33371
2060	6.12222
2065	5.90942
2070	5.69361
2075	5.50645
2080	5.36227
2085	5.25591
2090	5.17416
2095	5.10382
2100	5.0369