The value of public infrastructure assets in Nova Scotia amounted to $8.1 billion in 2007. Overall, Nova Scotia had the oldest public infrastructure in Canada in 2007. The average age of all five assets combined has been generally increasing from 14.2 years in 1973 to a high of 19.2 years in 2003. Recent investments in the highways and roads and wastewater treatment systems have reversed the trend and brought the overall average age to 18.0 years in 2007. However, this is still 1.7 years above the overall Canadian average.