Year	Percent
1950	12.67962
1955	13.82827
1960	12.82057
1965	9.45531
1970	8.25837
1975	8.69235
1980	9.44699
1985	9.64304
1990	8.16647
1995	7.02725
2000	5.63911
2005	4.94169
2010	5.56011
2015	5.28494
2020	4.81075
2025	4.39023
2030	4.13159
2035	4.01014
2040	4.09972
2045	4.22658
2050	4.2167
2055	4.09559
2060	4.00187
2065	4.00263
2070	4.11894
2075	4.28823
2080	4.40933
2085	4.44093
2090	4.41131
2095	4.39987
2100	4.44151