Year	Percent
1950	12.52834
1955	11.02859
1960	11.36253
1965	11.69951
1970	12.17645
1975	12.51532
1980	12.85592
1985	11.87424
1990	10.43566
1995	9.29643
2000	8.17589
2005	7.43904
2010	6.58981
2015	6.08056
2020	5.6069
2025	5.19837
2030	4.60653
2035	4.33465
2040	4.31078
2045	4.29857
2050	4.24152
2055	4.19166
2060	4.14905
2065	4.13548
2070	4.18161
2075	4.26663
2080	4.33061
2085	4.36276
2090	4.3723
2095	4.39177
2100	4.4267