Year	Percent
1950	12.80749
1955	11.62506
1960	13.08935
1965	14.04395
1970	13.46352
1975	12.80266
1980	12.97893
1985	11.67547
1990	8.87724
1995	10.60987
2000	10.15486
2005	9.33315
2010	9.61051
2015	8.78598
2020	8.02631
2025	7.60831
2030	7.37073
2035	7.15388
2040	6.85763
2045	6.52378
2050	6.24534
2055	6.05261
2060	5.9226
2065	5.80405
2070	5.66053
2075	5.50199
2080	5.36628
2085	5.27026
2090	5.22516
2095	5.19254
2100	5.14591