Year	Percent
1950	13.33762
1955	13.76175
1960	13.95018
1965	14.1794
1970	14.5145
1975	14.61941
1980	15.13271
1985	14.92335
1990	16.21498
1995	15.63911
2000	14.33948
2005	12.34988
2010	10.97567
2015	9.96954
2020	9.36953
2025	9.35293
2030	8.43329
2035	7.36759
2040	6.6183
2045	6.22062
2050	6.09591
2055	6.03108
2060	5.84523
2065	5.55114
2070	5.26373
2075	5.09801
2080	5.0642
2085	5.08098
2090	5.05921
2095	4.97247
2100	4.85862