Year	Percent
1950	4.48751
1955	4.29558
1960	4.22414
1965	4.19577
1970	4.21735
1975	4.21035
1980	4.16781
1985	4.0842
1990	4.1654
1995	4.00598
2000	3.86157
2005	3.7142
2010	3.60267
2015	3.91417
2020	4.14877
2025	4.37044
2030	4.58445
2035	4.87376
2040	5.2508
2045	5.64218
2050	6.09949
2055	6.59447
2060	7.16614
2065	7.91769
2070	8.84666
2075	9.80896
2080	10.77506
2085	11.77148
2090	12.81584
2095	13.90102
2100	15.0131