How do I create dynamic charts with the CSV Chart module?

I am attempting to create dynamic charts with numerical data from the mysql database but have not been able to figure out how to do this. Here is my attempt using a php snippet (I started with the snippet titled "List node count for each node type" posted here: http://drupal.org/node/233416

I modified the code to this snippet

<?php
function custom_count_pull(){
    $sql = "SELECT type, COUNT(nid) AS number, FROM_UNIXTIME(created, '%Y')  AS createdate FROM {node} GROUP BY type, createdate ORDER BY createdate DESC";
    $result = db_query($sql);
    $article_count = array();

    while ($data = db_fetch_object($result)){
        if (isset($article_count[$data->type])) {
       
            $article_count[$data->type][$data->createdate] = $data->number;
        } else {
            $article_count[$data->type] = array($data->createdate => $data->number);
        }
    }
    $today = date("Y");
    $years = array($today-2,$today-1,$today);

    $output .= "xdata,{$years[0]},{$years[1]},{$years[2]}\r\n";   
    foreach ($article_count as $type => $value) {
        $real_type_name = node_get_types('name', $type);
        $output .= "$real_type_name,";

        foreach ($years as $year) {
            if ($value[$year]):
            $output .= "{$value[$year]}";
            else:
            $output .= "0,";
            endif;
        }
        $output .= "\r\n";
    }
    $output .= "";
    return $output;
}

?>

The csvchart code block looks like this:

[csvdata]
title, Node count by data type
type, bvg
labels,Year,# of nodes

** What do I put here to insert the data???

[/csvdata]

This will be a very useful feature for my site and I'm guessing others will find a solution to this problem useful too.

Bob

p.s. I've already created a custom filter to handle the csvchart module and have successfully created charts with STATIC data as described in the csvchart module documentation. My goal is to find a way to create charts (page nodes) that are dynamically updated as the data in the database changes over time.