The table gives Sweden's nuclear power generation data in billions of kilowatt-hours. Let x = 5 represent 1980, x = 10 represent 1985, and so on.

Year|1980|1985|1990|1995|

Energy produced |25.3|55.8|65.2|66.5|

(a) Find a natural logarithm regression equation for the data.

Please and thanks!!