To detect shifts in trade source over time within species, species/unit/source combinations were analysed to determine if an increase or decrease in trade levels could be detected, on the basis of exporter-reported data.  For the purposes of this analysis, source codes were grouped into three categories: ‘Wild’ (source codes ‘W’, ‘U’ and source unspecified), ‘Captive-bred/Art. Prop.’ (source codes ‘A’, ‘C’, ‘D’, ‘F’) and ‘Ranched’ (source code ‘R’).

Trade levels were determined as showing either an overall increase or overall decrease based on the following criteria:

1. Slope divided by mean is greater than 0.15 (for overall increase) or less than -0.15 (for overall decrease), and
2. Coefficient of determination (R-squared value) is greater than or equal to 0.75, and
3. Total trade over the period 2003-2012 is greater than 50 units.

Trade levels were determined as showing either a sharp increase or sharp decrease based on the following criteria:

1. Average trade over the period 2008-2012 is over 3 times the average trade over the period 2003-2007 (for sharp increase), or vice versa (for sharp decrease), and
2. Number of non-zero data points over the period 2003-2012 is greater than five, and
3. Total trade over the period 2003-2012 is greater than 50 units.