The provided line graph illustrates the percentage of homes using electricity or natural gas for heating according to the year the houses were constructed.
Overall, the data reveals that natural gas is the predominant heating fuel in older homes, while newer homes show similar proportions of electricity and natural gas usage.
In detail, before 1950 and between 1950-1969, the majority of homes, at 60%, utilized natural gas for heating, in contrast to electricity, which was used by only 10% and 20% of homes, respectively. The usage of natural gas decreased to 50% for houses built between 1970-1989, while electricity saw a rise to 40%. Surprisingly, for houses constructed between 1990-2010, electricity became the primary heating fuel at 60%, with natural gas decreasing to 30%.
Furthermore, it is evident that older homes predominantly relied on natural gas for heating, with 60% of houses built before 1950 and 60% between 1950-1969 utilizing natural gas. Conversely, newer homes demonstrated a shift, with an equal percentage (45%) of houses built between 1990-2010 using electricity and natural gas for heating.