The line graph presents data on the utilization of two different heating fuels in houses categorized by the year they were constructed. Overall, natural gas is predominantly employed in older residences, whereas newer homes show a comparable reliance on both natural gas and electricity.
The usage of natural gas for heating remained relatively constant from houses built before 1950 to those built until 1969. However, there was a notable decline in usage, dropping to approximately 45%, for houses constructed between 1970 and 1989, after which it plateaued for houses built from 1990 to 2010.
In contrast, only 15% of houses built before 1950 utilized electricity for heating. This percentage steadily increased, reaching 45% for homes built between 1990 and 2010.
