Year	Percent
1950	10.76164
1955	10.74192
1960	9.66476
1965	9.69762
1970	9.96822
1975	10.74092
1980	11.3034
1985	11.84354
1990	11.15586
1995	10.21309
2000	8.93484
2005	8.02998
2010	7.50165
2015	7.34392
2020	6.63533
2025	6.22873
2030	5.82129
2035	5.22308
2040	4.97343
2045	4.99581
2050	5.01651
2055	4.96354
2060	4.89378
2065	4.81265
2070	4.7566
2075	4.76847
2080	4.83248
2085	4.88155
2090	4.90005
2095	4.89085
2100	4.88644