Year	Percent
1950	8.9136
1955	7.37746
1960	9.14497
1965	9.16644
1970	8.39001
1975	7.64691
1980	6.86471
1985	7.04433
1990	6.87201
1995	6.9216
2000	6.40929
2005	5.49205
2010	5.5958
2015	4.85468
2020	5.25762
2025	5.0576
2030	4.74659
2035	4.54053
2040	4.45673
2045	4.43542
2050	4.50354
2055	4.59192
2060	4.58763
2065	4.51488
2070	4.47549
2075	4.50073
2080	4.5699
2085	4.64795
2090	4.68925
2095	4.67343
2100	4.63733