Year	Percent
1950	11.41071
1955	12.33026
1960	10.07036
1965	8.0575
1970	7.85709
1975	8.01519
1980	8.61309
1985	7.05789
1990	6.12511
1995	5.35795
2000	4.80747
2005	4.63637
2010	4.40719
2015	4.34456
2020	4.26793
2025	4.14051
2030	4.04752
2035	4.02896
2040	4.07392
2045	4.14104
2050	4.19307
2055	4.21752
2060	4.22814
2065	4.25438
2070	4.31637
2075	4.38948
2080	4.44125
2085	4.4716
2090	4.46853
2095	4.4512
2100	4.43932