Year	Percent
1950	4.68458
1955	4.34073
1960	4.19767
1965	4.19292
1970	4.21724
1975	4.24286
1980	4.26679
1985	4.2988
1990	4.60093
1995	4.53158
2000	4.16788
2005	3.98407
2010	3.84897
2015	3.81519
2020	3.79486
2025	3.84798
2030	4.05441
2035	4.42846
2040	4.93857
2045	5.5363
2050	6.22928
2055	7.06235
2060	8.02545
2065	9.165
2070	10.42999
2075	11.77756
2080	13.20672
2085	14.69452
2090	16.2261
2095	17.7693
2100	19.28683