Current economic indexes reflect continued cautious optimism as the economy continues to work toward recovery. The AIA's billings index (ABI) for March 2011 basically held steady at 50.5. However, the new projects inquiry index was at 58.7, up significantly from its February mark of 56.4. The Electroindustry Business Confidence Index (EBCI) for current North American business conditions at the end of March 2011 measured 60.9, down from 69.6 in February. The change reflects concerns over the disruptions in the Middle East, and in Japan, in the aftermath of the earthquake and tsunami there. Although it saw modest gains in each of the previous five quarters, the Lighting System Index (LSI) closed 2010 with 4Q results at 75 points (on a scale of 110). The index receded 2.1 percent on a quarter-to-quarter basis, indicating that demand for lighting equipment has not fully recovered yet.