Year	Percent
1950	13.43692
1955	12.29978
1960	11.55237
1965	12.36278
1970	13.65101
1975	16.91062
1980	11.87011
1985	13.29155
1990	13.82715
1995	13.03696
2000	12.40831
2005	10.99911
2010	10.23532
2015	9.69293
2020	9.74778
2025	8.9714
2030	8.35229
2035	7.7548
2040	7.25297
2045	6.87752
2050	6.62024
2055	6.39812
2060	6.18522
2065	5.966
2070	5.78495
2075	5.64562
2080	5.54189
2085	5.46549
2090	5.3895
2095	5.31496
2100	5.241