The table below shows the number of live births per 1000 population in the United States, starting in 1965.

Year | 1965 | 1970 | 1975 | 1980 | 1985 | 1990 | 1995 | 2000 | 2005 | 2010 | 2015

Rate | 19.4 | 18.40|14.80 | 15.90| 15.60| 16.40 | 14.80| 14.40| 14.00 | 13.00| 12.40

After using excel to form a scatterplot I can see that there is a negative relationship between the year and birthrates. The trend is fairly straight and there are no apparent outliers.

How can I find the equation of the regression line?