Year	Percent
1950	13.38587
1955	13.73879
1960	13.66531
1965	14.05009
1970	14.23019
1975	14.71082
1980	12.53503
1985	11.30123
1990	10.8593
1995	10.86124
2000	10.19638
2005	9.08531
2010	8.05277
2015	7.98557
2020	7.6778
2025	7.34511
2030	7.03528
2035	6.72489
2040	6.43035
2045	6.20551
2050	6.04955
2055	5.92033
2060	5.78408
2065	5.63263
2070	5.48987
2075	5.37534
2080	5.29039
2085	5.2274
2090	5.16914
2095	5.10886
2100	5.04911