Year	Percent
1950	13.69247
1955	13.90575
1960	12.8507
1965	16.17715
1970	14.36326
1975	13.14422
1980	11.00759
1985	10.69761
1990	10.68637
1995	10.1595
2000	10.47691
2005	8.92351
2010	6.71598
2015	6.98288
2020	6.23355
2025	5.85335
2030	5.5878
2035	5.3911
2040	5.23211
2045	4.80843
2050	4.43838
2055	4.25026
2060	4.1945
2065	4.18291
2070	4.13668
2075	4.05469
2080	3.9687
2085	3.93099
2090	3.97079
2095	4.04806
2100	4.12562