Year	Percent
1950	13.1752
1955	13.46652
1960	13.98243
1965	14.84529
1970	15.29157
1975	14.28403
1980	13.50132
1985	12.94192
1990	12.45784
1995	11.59063
2000	9.59794
2005	8.00577
2010	7.22303
2015	7.33898
2020	8.28903
2025	7.7314
2030	6.92278
2035	6.14455
2040	5.69202
2045	5.65873
2050	5.79131
2055	5.79393
2060	5.57965
2065	5.27223
2070	5.06771
2075	5.03527
2080	5.09957
2085	5.13646
2090	5.07544
2095	4.93983
2100	4.81938