Year	Percent
1950	10.24933
1955	9.24187
1960	9.54665
1965	8.90968
1970	8.85919
1975	8.20315
1980	7.83121
1985	7.04275
1990	5.57092
1995	5.09219
2000	4.95215
2005	4.93511
2010	5.10974
2015	4.48869
2020	3.96582
2025	3.69061
2030	3.70134
2035	3.82148
2040	3.95445
2045	3.97652
2050	3.87137
2055	3.76422
2060	3.77296
2065	3.90805
2070	4.09416
2075	4.23476
2080	4.27863
2085	4.24529
2090	4.2106
2095	4.23063
2100	4.30427