Year	Percent
1950	13.91639
1955	14.26692
1960	12.88537
1965	13.49405
1970	13.84281
1975	14.43979
1980	14.71583
1985	14.85761
1990	14.53457
1995	15.74313
2000	14.12046
2005	12.117
2010	10.46806
2015	9.73481
2020	8.77509
2025	8.27524
2030	7.56298
2035	6.83556
2040	6.22437
2045	5.80151
2050	5.53702
2055	5.35174
2060	5.17141
2065	4.98161
2070	4.81648
2075	4.71361
2080	4.67983
2085	4.68372
2090	4.68841
2095	4.67291
2100	4.64786