Year	Percent
1950	12.06465
1955	11.20504
1960	11.82916
1965	12.35554
1970	12.4547
1975	12.69962
1980	11.9038
1985	11.2172
1990	11.43691
1995	11.48863
2000	10.45305
2005	9.59711
2010	9.17459
2015	8.2294
2020	7.34254
2025	7.01573
2030	6.5965
2035	6.17723
2040	5.81453
2045	5.53096
2050	5.30382
2055	5.13083
2060	5.01698
2065	4.91878
2070	4.84115
2075	4.79041
2080	4.76091
2085	4.7565
2090	4.76391
2095	4.76797
2100	4.76604