| Chart Input Table: | PLADRL## |
| Chart Type: | Histogram |
| Y-Axis: | Number of wells drilled each year |
| Y-Axis Label: | Wells |
| X-Axis: | 1900, 1901, ... 1993 |
| X-Axis Label: | 1900, 1910, 1920, 1930, 1940, 1950, 1960, 1970, 1980,1990 |
| Chart Function: | Chart shows the annual number of wells drilled per year for the discovery history. |