Year	Percent
1950	19.56607
1955	19.47644
1960	19.84505
1965	17.71987
1970	15.09566
1975	13.971
1980	14.37786
1985	14.53917
1990	13.5467
1995	12.65526
2000	11.95323
2005	10.72236
2010	10.30706
2015	9.76475
2020	8.92539
2025	8.28208
2030	7.87111
2035	7.56268
2040	7.23059
2045	6.88889
2050	6.56169
2055	6.25642
2060	5.99291
2065	5.77691
2070	5.61127
2075	5.46278
2080	5.30988
2085	5.17143
2090	5.04554
2095	4.94956
2100	4.88063