The second chart illustrate the marital status of adult Americans between 1970 to 2000.
In 1970 and 1980, there were 2.5 millions marriage couples.
However, the divorces couples inceased from 1 million to 1.4 millions.
As the divorces rate growth, there was a slightly decreasing rate on marriages.
It's common sense that the less marriages couples, the less divorces couples.
Therefore, the divorce rates declined from 1.4 millions to 1 million between 1998 to 2000.
Overall, from 1970 to 2000, it created trend of not getting marry due to the growth of divorce rate.
On the second chart, it indicates that the percentage of adults being married dropped