Year	Percent
1950	10.39761
1955	9.27178
1960	9.54405
1965	9.45221
1970	10.7549
1975	10.72157
1980	10.7414
1985	11.15946
1990	12.13185
1995	11.13334
2000	10.121
2005	9.67578
2010	9.47307
2015	9.18456
2020	8.4248
2025	7.81489
2030	7.55278
2035	7.10771
2040	6.64316
2045	6.20385
2050	5.84499
2055	5.56734
2060	5.36672
2065	5.20271
2070	5.06647
2075	4.93347
2080	4.83831
2085	4.76645
2090	4.72556
2095	4.70138
2100	4.67945