Home ownership in Sydney was less common than renting prior to the Second World War but this trend has since reversed. Median house prices have increased by an average of 8.6% per annum since 1970. The median house price in Sydney in March 2014 was $630,000. The primary cause for rising prices is the increasing cost of land which made up 32% of house prices in 1977 compared to 60% in 2002. 31.6% of dwellings in Sydney are rented, 30.4% are owned outright and 34.8% are owned with a mortgage. 11.8% of mortgagees in 2011 had monthly loan repayments of less than $1,000 and 82.9% had monthly repayments of $1,000 or more. 44.9% of renters for the same period had weekly rent of less than $350 whilst 51.7% had weekly rent of $350 or more. The median weekly rent in Sydney is $450.
Question: How many more percentage of house prices rose from 1977 to 2002?
Answer: 28