Fix grammatical errors in this sentence: The graph showing the information from average number from child under family reveals that Spain had the Highest average number at 1980 with 2.2 children per family and the lowest before 2000 about 1.2 children per family, representing the highest decrease amongst the country shown concerning nearly 50% decrease in 20 years.
The graph showing information on the average number of children per family reveals that Spain had the highest average number in 1980 with 2.2 children per family and the lowest in 2000 with 1.2 children per family, representing the biggest decrease amongst the countries shown, with a decrease of nearly 50% in 20 years.