year	incvote	septtrial	gdpgrow
1948	52.32	45.61	0.91
1952	44.59	42.11	0.27
1956	57.75	55.91	0.64
1960	49.92	50.54	-0.26
1964	61.34	69.15	0.81
1968	49.60	41.89	1.63
1972	61.79	62.89	1.73
1976	48.95	40.00	1.17
1980	44.70	48.72	-2.43
1984	59.17	60.22	1.79
1988	53.90	54.44	0.79
1992	46.55	41.94	0.35
1996	54.74	60.67	1.04