Year	Percent
1950	10.62749
1955	10.33793
1960	9.92032
1965	9.61783
1970	10.38114
1975	10.97618
1980	11.07099
1985	11.02711
1990	11.03964
1995	11.05823
2000	11.0039
2005	10.85153
2010	10.60785
2015	10.3641
2020	10.20771
2025	10.2176
2030	10.30176
2035	10.08297
2040	9.82514
2045	9.58049
2050	9.38195
2055	9.2207
2060	9.05902
2065	8.88435
2070	8.69609
2075	8.51354
2080	8.34385
2085	8.18325
2090	8.03057
2095	7.88974
2100	7.75445