The value of public infrastructure in British Columbia amounted to $40.9 billion in 2007, representing 14% of the national total. Overall, the average age of the public infrastructure in British Columbia increased from a low of 14.7 years in 1973 to a high of 16.7 years in 2002. However, the discarding of large older investments and inflows of new stock into the water supply systems since then has reversed the trend and lowered the age to an average of 16.3 years in 2007, matching the national average.