Index value plot

http://images.google.com/imgres?imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu_75SYQivKlUjMOzWAOeXD8LiemVzIWEAxCVQRq63AXzclHvgOV5XlWqhXxvPwKQcYV-iHW_1a-xiHc4xQTd8BYwN6qgd4qw8JyzWLTixPoUoqEav72w99hAOJI84D481sneXAXI9pbU/s320/index+value+plot.gif&imgrefurl=http://mavance2000.blogspot.com/2008/07/index-value-plot.html&usg=__2n27SvHUB_3moyFmL2yHAmqtvtc=&h=262&w=320&sz=51&hl=en&start=1&um=1&itbs=1&tbnid=48P8wB-dzl_PwM:&tbnh=97&tbnw=118&prev=/images%3Fq%3Dindex%2Bvalue%2Bplot%26um%3D1%26hl%3Den%26client%3Dsafari%26sa%3DN%26rls%3Den%26tbs%3Disch:1

In an index value plot does not display the absolute value on the graph. To get the index number, the data is divided by the average and then multiplied by 100. In the index value plot above shows the steamflow in the United States.