历史上选举年，今年根据历史数据大概率涨

1960: +0.5%, Kennedy (D) elected

1964: +16.5%, Johnson (D) elected

1968: +11.1%, Nixon (R) elected

1972: +19.0%, Nixon (R) elected

1976: +23.8%, Carter (D) elected

1980: +32.4%, Reagan (R) elected

1984: +6.3%, Reagan (R) elected

1988: +16.8%, Bush H.W. (R) elected

1992: +7.7%, Clinton (D) elected

1996: +23.1%, Clinton (D) elected

2000: -9.1%, Bush W. (R) elected

2004: +10.9%, Bush W. (R) elected

2008: -37.0%, Obama (D) elected

2012: +16.0%, Obama (D) elected

2016: +12.0%, Trump (R) elected

2020: +18.4%, Biden (D) elected