Year	Percent
1950	9.77721
1955	9.40368
1960	9.43527
1965	10.31295
1970	11.01336
1975	11.31959
1980	11.74214
1985	11.52164
1990	10.02874
1995	10.03848
2000	10.02125
2005	9.50103
2010	8.98188
2015	8.15645
2020	7.75468
2025	7.16404
2030	6.64132
2035	6.23934
2040	5.85982
2045	5.56849
2050	5.33796
2055	5.16108
2060	5.03169
2065	4.92363
2070	4.84248
2075	4.78203
2080	4.74713
2085	4.72957
2090	4.72682
2095	4.7222
2100	4.72373