Year	Percent
1950	17.8046
1955	17.436
1960	17.25908
1965	17.05436
1970	16.05467
1975	13.98374
1980	10.80392
1985	9.10264
1990	8.83635
1995	8.65281
2000	8.43902
2005	7.87421
2010	6.97958
2015	6.47547
2020	5.80196
2025	5.88603
2030	6.196
2035	6.18878
2040	5.85315
2045	5.46621
2050	5.21722
2055	5.18745
2060	5.30965
2065	5.36291
2070	5.23314
2075	4.98583
2080	4.77595
2085	4.69624
2090	4.73376
2095	4.80594
2100	4.81316