Year	Percent
1950	11.87511
1955	13.4519
1960	14.27545
1965	15.13038
1970	15.12284
1975	13.46085
1980	11.65819
1985	12.69959
1990	13.04799
1995	13.42278
2000	12.58408
2005	13.16722
2010	10.04087
2015	11.85831
2020	11.51907
2025	11.14473
2030	10.58702
2035	9.88393
2040	9.33432
2045	9.2049
2050	9.25115
2055	9.05468
2060	8.63775
2065	8.15115
2070	7.75722
2075	7.54025
2080	7.43394
2085	7.29172
2090	7.02282
2095	6.68495
2100	6.39596