The latest Producer Price Index report, released Tuesday morning by the U.S. Bureau of Labor Statistics, showed the PPI rose 0.5 percent in April. Softwood lumber showed a big surge from March to April, up 6.2 percent on a seasonally adjusted month-to-month basis. Still, softwood lumber is still down 4.3 percent for the year, unadjusted. On the same annual basis, bolts, nuts and screws showed the biggest increase, up 9.4 percent. Here are the numbers across 10 key, industry commodities:  According to analysis from Associated Builders and Contractors ...