Source:	Collen, et al., (2009). Conservation Biology, 23(2), 317-327.
	WWF. 2012. Living Planet Report 2012. 
Note: 	The Living Planet Index (LPI) reflects changes in the health of the planet's ecosystems by tracking trends in over 9,000 populations of vertebrate species. Much as a stock market index tracks the value of a set of shares over time as the sum of its daily change, the LPI first calculates the annual rate of change for each species' population in the dataset. The index then calculates the average change across all populations for each year from 1970, when data collection began, to 2008, the latest date for which data is available (Collen et al., 2009).
	
	
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Year	Living Planet Index
1970	99.91
1971	99.91
1972	101.07
1973	101.95
1974	102.82
1975	102.82
1976	103.4
1977	103.11
1978	102.53
1979	102.24
1980	102.24
1980	101.37
1982	99.91
1983	98.16
1984	95.83
1985	93.21
1986	90.59
1987	88.55
1988	87.09
1989	86.22
1990	85.93
1991	85.05
1992	84.18
1993	82.72
1994	81.85
1995	81.27
1996	80.98
1997	79.52
1998	77.77
1999	76.32
2000	74.86
2001	73.7
2002	73.11
2003	73.11
2004	73.11
2005	72.53
2006	71.95
2007	71.66
2008	71.95