Year	Percent
1950	13.03455
1955	14.08909
1960	16.35579
1965	17.0205
1970	16.31834
1975	14.10148
1980	12.83294
1985	12.56032
1990	11.73053
1995	11.13238
2000	10.5624
2005	9.08052
2010	7.99504
2015	6.97106
2020	7.58444
2025	6.94543
2030	6.25028
2035	5.6197
2040	5.14998
2045	4.9046
2050	4.78076
2055	4.64736
2060	4.42541
2065	4.14162
2070	3.9357
2075	3.8423
2080	3.83936
2085	3.84651
2090	3.79973
2095	3.69542
2100	3.58664