Year	Percent
1950	13.77893
1955	14.41403
1960	17.6199
1965	18.82529
1970	19.06226
1975	18.07587
1980	17.82997
1985	19.73296
1990	19.05159
1995	15.71146
2000	11.77064
2005	9.38194
2010	9.03923
2015	9.18325
2020	8.20163
2025	6.80036
2030	5.5926
2035	5.0011
2040	4.97933
2045	5.10159
2050	4.9794
2055	4.59758
2060	4.20648
2065	4.01305
2070	4.06214
2075	4.21374
2080	4.30747
2085	4.27303
2090	4.16985
2095	4.10506
2100	4.13158