Magento: Display tier prices at category listing page

Question

I'm trying to display all tier prices on category listing page (catalog/product/list.phtml) but only getting the basic price for a single product.

print_r($_product->getTierPrice());

returns:

Array
(
    [0] => Array
        (
            [price] => 0.5000
            [website_price] => 0.5000
            [price_qty] => 1
            [cust_group] => 32000
        )

)

for each product. On the product info page it works w/o problems. Please advise.

ver. 1.5.0.1

UPDATE:

Here is the solution for the problem inspired with the answer below:

$resource = Mage::getSingleton('core/resource');
$query = 'SELECT * FROM ' . $resource->getTableName('catalog/product') . '_tier_price';
$_tier_prices = $resource->getConnection('core_read')->fetchAll($query);
var_dump($_tier_prices);

Answer 1

This is another way to get the tier prices

Mage::getResourceModel('catalog/product_attribute_backend_tierprice')
            ->loadPriceData($product_id,Mage::app()->getWebsite()->getId());

The response is array with prices

[0] => Array
    (
        [price_id] => 7
        [website_id] => 0
        [all_groups] => 1
        [cust_group] => 0
        [price] => 32.0000
        [price_qty] => 6.0000
    )

[1] => Array
    (
        [price_id] => 8
        [website_id] => 0
        [all_groups] => 1
        [cust_group] => 0
        [price] => 31.0000
        [price_qty] => 12.0000
    )

Answer 2

If you are looking for a Magento way:

 $attribute = $_product->getResource()->getAttribute('tier_price');

    if ($attribute) {
       $attribute->getBackend()->afterLoad($_product);
       $tierPrices = $_product->getTierPrice();
    }

From /app/code/core/Mage/Catalog/Model/Product/Type/Price.php getTierPrice()