Year	Percent
1950	18.28875
1955	19.19265
1960	18.92913
1965	18.7626
1970	17.73212
1975	15.11668
1980	14.70008
1985	14.14872
1990	13.00867
1995	11.9724
2000	10.60522
2005	9.82405
2010	8.85921
2015	8.03938
2020	7.40562
2025	6.82908
2030	6.37964
2035	6.0192
2040	5.7324
2045	5.50641
2050	5.31464
2055	5.15925
2060	5.03041
2065	4.93097
2070	4.85531
2075	4.80446
2080	4.764
2085	4.74035
2090	4.72248
2095	4.71338
2100	4.70695