Year	Percent
1950	13.41781
1955	13.47752
1960	12.52325
1965	15.41272
1970	16.88934
1975	18.42139
1980	13.64935
1985	13.77295
1990	10.62963
1995	9.70994
2000	9.71049
2005	8.06738
2010	8.08626
2015	7.03372
2020	6.70436
2025	5.90401
2030	5.48141
2035	5.36696
2040	5.35945
2045	5.39209
2050	5.35637
2055	5.22541
2060	5.08918
2065	5.0301
2070	5.03295
2075	5.04318
2080	5.01596
2085	4.9498
2090	4.87212
2095	4.8192
2100	4.80022