How do I calculate all total score for the current year?

$sectionb_total_score = 0;
	$Year = date('Y');
	$mySQL2 = 'SELECT COUNT(A.id) as TotalID, SUM(A.total_score) as TotalScore, A.year_assessment FROM assessment_technical A INNER JOIN assessment_year B ON A.assessment_year_id = B.id WHERE A.year_assessment = B.year_assessment AND A.staff_id =' .$data['staff_id'] ;
	$result2 = mysql_query($mySQL2);
	if ($result2){
		if (mysql_num_rows($result2) > 0){
		$row2 = mysql_fetch_assoc($result2);
		$sectionb_total_score = $row2['TotalScore'] / $row2['TotalID'];
		}
	}