Year	Percent
1950	14.89729
1955	18.27345
1960	17.19863
1965	17.49181
1970	17.53292
1975	14.90595
1980	13.67693
1985	12.79708
1990	13.80668
1995	11.18701
2000	9.7434
2005	8.79491
2010	7.9363
2015	7.91386
2020	7.32259
2025	6.80461
2030	6.40859
2035	6.0592
2040	5.76545
2045	5.53808
2050	5.34642
2055	5.17125
2060	5.01198
2065	4.88602
2070	4.78925
2075	4.7162
2080	4.65223
2085	4.5993
2090	4.54616
2095	4.50729
2100	4.47521