Year	Percent
1950	12.2112
1955	8.10248
1960	7.98033
1965	13.31905
1970	13.44162
1975	15.31736
1980	14.92864
1985	12.60264
1990	12.25741
1995	13.31699
2000	14.14778
2005	13.0618
2010	11.64169
2015	10.51729
2020	9.69511
2025	8.97693
2030	8.60296
2035	8.085
2040	7.48383
2045	6.92969
2050	6.48571
2055	6.15102
2060	5.89264
2065	5.66875
2070	5.47303
2075	5.30777
2080	5.17383
2085	5.08163
2090	5.02411
2095	4.97393
2100	4.9312