Year	Percent
1950	16.66713
1955	18.64142
1960	20.02056
1965	18.86157
1970	16.70278
1975	15.23271
1980	12.2411
1985	12.73855
1990	12.59918
1995	12.01235
2000	11.02809
2005	10.04095
2010	9.22925
2015	8.80142
2020	8.28266
2025	7.8092
2030	7.36351
2035	6.92377
2040	6.5487
2045	6.2522
2050	6.00778
2055	5.79985
2060	5.6039
2065	5.42815
2070	5.27855
2075	5.15055
2080	5.05725
2085	4.97813
2090	4.91209
2095	4.85089
2100	4.80092