creating table upon plugin activation doest work

I followed this

http://codex.wordpress.org/Creating_Tables_with_Plugins

it doesnt work. I didnt need the upgrade feature so i didnt add it.

heres the full code of my php file

//Installation Process
global $westpac_store_version;
$westpac_store_version = '1.0';

function westpac_store_install() {
	global $wpdb;
	global $westpac_store_version;

	$table_name = $wpdb->prefix . 'westpac_store';

	/*
	 * We'll set the default character set and collation for this table.
	 * If we don't do this, some characters could end up being converted
	 * to just ?'s when saved in our table.
	 */
	$charset_collate = '';

	if ( ! empty( $wpdb->charset ) ) {
	  $charset_collate = "DEFAULT CHARACTER SET {$wpdb->charset}";
	}

	if ( ! empty( $wpdb->collate ) ) {
	  $charset_collate .= " COLLATE {$wpdb->collate}";
	}

	$sql = "CREATE TABLE " . $table_name . " (
		itemID mediumint(9) NOT NULL AUTO_INCREMENT,
		itemModel varchar(55) NOT NULL,
		itemCat text NOT NULL,
		itemManuf varchar(55) NOT NULL,
		itemSpec text NOT NULL,
                itemDesc text NOT NULL,
                itemImg text DEFAULT 'none' NOT NULL,
                itemPrice decimal(19,4) DEFAULT 0 NOT NULL
		UNIQUE KEY itemID (itemID)
	) " . $charset_collate . ";";

	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
	dbDelta( $sql );
	add_option( 'westpac_store_version', $westpac_store_version );
}
register_activation_hook( __FILE__, 'westpac_store_install' );

//Adding Westpac Store Menu
add_action('admin_menu', 'westpac_store');
function westpac_store(){
    add_menu_page(
            'Westpac Store',
            'Westpac Store',
            'manage_options',
            'westpac-store',
            'westpac_store_page',
            'dashicons-cart',
            '4.1'
    );
}
//Westpac Store Interface
function westpac_store_page(){ ?>

    <div>
    <h2>Westpac Store</h2>
    View all product section
    </div>

<?php }

//Adding Westpac Store Add Sub-menu
add_action('admin_menu', 'westpac_store_add');
function westpac_store_add(){
    add_submenu_page(
            'westpac-store',
            'Westpac Store - Add Item',
            'Add Item',
            'manage_options',
            'westpac-store-add',
            'westpac_store_add_page'
    );
}
//Westpac Store Add Interface
function westpac_store_add_page(){ ?>

    <div>
    <h2>Westpac Store - Add Item</h2>
    Add item section
    </div>
<?php }

?>