Year	Percent
1950	13.49372
1955	12.25423
1960	13.14855
1965	11.92221
1970	9.60919
1975	9.14406
1980	8.73278
1985	9.15435
1990	9.15454
1995	8.39027
2000	7.2151
2005	5.97796
2010	5.75244
2015	5.67785
2020	5.3684
2025	4.91966
2030	4.69364
2035	4.60039
2040	4.57172
2045	4.51373
2050	4.40796
2055	4.3086
2060	4.25367
2065	4.26912
2070	4.31611
2075	4.35434
2080	4.37201
2085	4.37472
2090	4.37603
2095	4.39957
2100	4.43159