Year	Percent
1950	13.50638
1955	12.63592
1960	13.5531
1965	12.25945
1970	11.55651
1975	10.53749
1980	10.52084
1985	9.23249
1990	10.23119
1995	9.34649
2000	8.6331
2005	7.13801
2010	4.43199
2015	4.73279
2020	4.80821
2025	4.67637
2030	4.46077
2035	4.23539
2040	3.94532
2045	3.79575
2050	3.79606
2055	3.81605
2060	3.82216
2065	3.78419
2070	3.73365
2075	3.71372
2080	3.73557
2085	3.79663
2090	3.85712
2095	3.89646
2100	3.91751