Year	Percent
1950	10.15195
1955	10.67988
1960	9.79902
1965	9.04549
1970	9.77441
1975	10.83552
1980	11.18724
1985	10.30951
1990	9.77653
1995	9.79602
2000	9.00061
2005	10.27521
2010	10.02667
2015	8.64367
2020	6.74544
2025	5.47213
2030	5.82828
2035	5.77366
2040	5.79147
2045	5.6206
2050	5.20729
2055	4.78772
2060	4.63028
2065	4.69386
2070	4.76148
2075	4.74358
2080	4.64182
2085	4.53214
2090	4.5085
2095	4.58467
2100	4.67589