Year	Percent
1950	14.94767
1955	17.07213
1960	16.52987
1965	16.20384
1970	16.3295
1975	16.45558
1980	16.71094
1985	16.78742
1990	16.7568
1995	15.87489
2000	15.59042
2005	13.97422
2010	12.31395
2015	10.37714
2020	9.73528
2025	9.07402
2030	8.2547
2035	7.35645
2040	6.6273
2045	6.15452
2050	5.79918
2055	5.47975
2060	5.16861
2065	4.88976
2070	4.67069
2075	4.51698
2080	4.42346
2085	4.36197
2090	4.31519
2095	4.27813
2100	4.25267