Year	Percent
1950	13.20646
1955	10.38201
1960	10.31884
1965	12.94148
1970	14.86222
1975	14.45491
1980	14.34124
1985	14.04746
1990	16.27403
1995	16.56911
2000	14.38957
2005	9.85577
2010	7.4526
2015	6.95202
2020	7.48145
2025	6.86862
2030	5.83383
2035	4.8586
2040	4.36213
2045	4.35917
2050	4.50355
2055	4.44855
2060	4.16022
2065	3.85454
2070	3.72487
2075	3.82291
2080	4.02351
2085	4.16455
2090	4.1585
2095	4.06493
2100	4.00217