Year	Percent
1950	11.16674
1955	15.40813
1960	17.34498
1965	17.61867
1970	15.81947
1975	15.2659
1980	15.06388
1985	14.8054
1990	15.28542
1995	13.8089
2000	10.54897
2005	10.25979
2010	10.22535
2015	11.83392
2020	10.63316
2025	9.28626
2030	8.28007
2035	7.90417
2040	7.91094
2045	7.81099
2050	7.40837
2055	6.84546
2060	6.39876
2065	6.17684
2070	6.10215
2075	6.03344
2080	5.87407
2085	5.64524
2090	5.43567
2095	5.31248
2100	5.27634