The Study of the Spatial Heterogeneity and Structural Evolution of the Producer Services Trade Network

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Year</td><td class="align_center">2000</td><td class="align_center">2004</td><td class="align_center">2008</td><td class="align_center">2012</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">Core layer</td><td class="align_center">12</td><td class="align_center">15</td><td class="align_center">11</td><td class="align_center">12</td></tr><tr><td class="align_left">Semi-periphery layer</td><td class="align_center">46</td><td class="align_center">38</td><td class="align_center">42</td><td class="align_center">38</td></tr><tr><td class="align_left">Periphery layer</td><td class="align_center">3</td><td class="align_center">8</td><td class="align_center">8</td><td class="align_center">11</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Number of core, semi-periphery, and periphery countries, 2000–2012.</div>

Complexity

tab6

Table 6

Table 6: The Study of the Spatial Heterogeneity and Structural Evolution of the Producer Services Trade Network 