Year	Percent
1950	14.80137
1955	15.82721
1960	12.75766
1965	13.53392
1970	14.73766
1975	15.20365
1980	14.69467
1985	15.44196
1990	14.03917
1995	15.26441
2000	13.44177
2005	12.61366
2010	11.71303
2015	10.46059
2020	9.9009
2025	9.35521
2030	8.85505
2035	8.32682
2040	7.77378
2045	7.26963
2050	6.87427
2055	6.5934
2060	6.38637
2065	6.21647
2070	6.05034
2075	5.90895
2080	5.7846
2085	5.70988
2090	5.65713
2095	5.61685
2100	5.57709