Year	Percent
1950	12.54
1955	13.72121
1960	15.35421
1965	14.61557
1970	15.62967
1975	14.98091
1980	12.32796
1985	10.80564
1990	9.90383
1995	10.08209
2000	9.50401
2005	8.68572
2010	8.68252
2015	7.98146
2020	7.53422
2025	6.89873
2030	6.55966
2035	6.37609
2040	6.19046
2045	5.94689
2050	5.67968
2055	5.4629
2060	5.30819
2065	5.20771
2070	5.10978
2075	4.99642
2080	4.86625
2085	4.74648
2090	4.66136
2095	4.61041
2100	4.57917