During the 20 years of collective agricultural production, the annual agricultural output was 30-50 billion kilograms, yet by the time of 1984, the number increased to 400 billion kilograms. At the same time, the overall agricultural GDP increased by 68% and the average income of farmers increased by 166%. The success of the household responsibility system signified a significant transition in China's economic model and opened a new era of China's agricultural economy and rural development.[4]