Year	Percent
1950	11.28701
1955	11.63676
1960	10.36645
1965	9.66561
1970	10.54096
1975	11.18658
1980	13.8275
1985	10.86101
1990	10.16758
1995	8.82856
2000	9.10268
2005	8.44949
2010	7.53543
2015	7.25512
2020	7.27637
2025	7.20409
2030	6.74491
2035	6.45686
2040	6.3678
2045	6.29519
2050	6.11023
2055	5.86522
2060	5.56984
2065	5.34399
2070	5.16854
2075	5.00623
2080	4.82995
2085	4.66561
2090	4.50865
2095	4.40277
2100	4.33283