Year	Percent
1950	10.44856
1955	10.21074
1960	9.86059
1965	9.71819
1970	10.54137
1975	10.65975
1980	10.60876
1985	10.56912
1990	10.63437
1995	10.24672
2000	9.60186
2005	9.71448
2010	10.3378
2015	10.02618
2020	8.44275
2025	7.67986
2030	7.26851
2035	7.128
2040	6.78636
2045	6.31784
2050	5.84116
2055	5.45401
2060	5.204
2065	5.05184
2070	4.91142
2075	4.7536
2080	4.59278
2085	4.48034
2090	4.42392
2095	4.41263
2100	4.40715