Year	Percent
1950	16.23036
1955	16.69475
1960	17.21015
1965	17.25652
1970	16.8363
1975	14.8809
1980	12.78803
1985	10.77485
1990	9.18722
1995	8.36058
2000	7.16263
2005	6.20787
2010	5.71976
2015	5.31596
2020	4.64994
2025	4.32625
2030	4.24684
2035	4.17291
2040	4.05557
2045	3.95259
2050	3.87228
2055	3.83873
2060	3.87689
2065	3.96217
2070	4.03161
2075	4.06878
2080	4.08144
2085	4.10309
2090	4.14596
2095	4.21023
2100	4.26785