In the time period 1999-2009, while the world tiger population decreased from 6000 to 3200, the human population increased from 6000 million to 6800 million.
This implies that tiger population declined by 6.3 percent in the 10 year period, while human population increased by 1.3 percent.
Tiger Fact Sheet. (n.d.). Retrieved November 13, 2012, from http://library.sandiegozoo.org/factsheets/tiger/tiger.htm
Little, J. S., & Triest, R. K. (2001). Seismic Shifts: The Economic Impact of Demographic Change. An Overview. Conference series-Federal Reserve Bank of Boston (Vol. 46, pp. 1–30). Retrieved from http://www.bostonfed.org/economic/conf/conf46/conf46a.pdf