Country rates of change (progression or regression, percent per year) in access to sanitation were compared to the performance frontier (best-in-class performance) to generate a country value for performance in improving sanitation access. Values for sanitation access performance were calculated for 133 countries. Figure 12 summarizes the values.
[[File:WASH_performance_index1.png|thumb|none|700px650px|Figure 12: Sanitation access performance: component values by country. Source: [http://waterinstitute.unc.edu/files/2015/04/SA-a.png waterinstitute.unc.edu]]]
Figure 13 shows sanitation coverage by country. While coverage is low across much of Sub-Saharan Africa, sanitation access performance is often better depending on the country. Many countries in Southeast Asia and South America also have better performance than coverage.
[[File:WASH_performance_index2.png|thumb|none|700px650px|Figure 13: Global sanitation coverage by country (percentage). Source: [http://waterinstitute.unc.edu/files/2015/04/SA-b.png waterinstitute.unc.edu]]]
Figure 14 shows all the rates of change used in defining the performance frontier for sanitation access. Points defining the performance frontier were Niger (1995), Cambodia (1996), Mozambique (2008), Rwanda (2002), Thailand (1990), Bosnia and Herzegovina (2007), Jordan (2006), Estonia (2006), and Estonia (2007). Figure 15 only shows the latest rates of change from each country.
[[File:WASH_performance_index3.png|thumb|none|700px650px|Figure 14: Performance frontier for sanitation access performance based on rates of change from all countries and all times. Source: [http://waterinstitute.unc.edu/files/2015/04/SA-14.png waterinstitute.unc.edu]]]
[[File:WASH_performance_index4.png|thumb|none|700px650px|Figure 15. Sanitation access performance: 2015 values. Source: [http://waterinstitute.unc.edu/files/2015/04/SA-15.png waterinstitute.unc.edu]]]
===Top and bottom performing countries===
Table 4 shows the trend in country values for sanitation access performance. The trends suggest countries with a positive value are more likely to be improving over time (36%) rather than deteriorating. Conversely, the majority (54%) of countries with a negative value were deteriorating over time rather than improving. This suggests, for sanitation access performance, that improvement and deterioration are long-term phenomena.
[[File:WASH_performance_index5.png|thumb|none|700px650px|Table 4. Trends in sanitation access performance. Source: [http://waterinstitute.unc.edu/wash-performance-index-report/ waterinstitute.unc.edu]]]
