Let's start off with 2 charts.
<iframe width="600" height="371" seamless frameborder="0" scrolling="no" src="https://docs.google.com/spreadsheets/d/1gEjX5751zdYWom0_JG1FFLhM17l0OyWbUgWK90of59Q/pubchart?oid=381229711&amp;format=interactive"></iframe>
<iframe width="600" height="371" seamless frameborder="0" scrolling="no" src="https://docs.google.com/spreadsheets/d/1gEjX5751zdYWom0_JG1FFLhM17l0OyWbUgWK90of59Q/pubchart?oid=722963661&amp;format=interactive"></iframe>
<iframe width="600" height="371" seamless frameborder="0" scrolling="no" src="https://docs.google.com/spreadsheets/d/1gEjX5751zdYWom0_JG1FFLhM17l0OyWbUgWK90of59Q/pubchart?oid=1083990145&amp;format=interactive"></iframe>
<iframe width="600" height="371" seamless frameborder="0" scrolling="no" src="https://docs.google.com/spreadsheets/d/1gEjX5751zdYWom0_JG1FFLhM17l0OyWbUgWK90of59Q/pubchart?oid=1438814030&amp;format=interactive"></iframe>