protected function extra_tablenav( $which ) {

		if ( $which !== 'top' ) {
			return;
		}

		$this->months_dropdown( '' );

		$selected = isset( $_GET['level'] ) ? $_GET['level'] : '';
		?>

		<label for="filter-by-level" class="screen-reader-text">
			<?php echo $this->translations['levelFilterLabel']; ?>
		</label>

		<select name="level" id="filter-by-level">

			<option value=""><?php echo $this->translations['allLevels']; ?></option>

			<?php foreach ( $this->get_levels() as $level => $label ): ?>

				<option value="<?php echo esc_attr( $level ); ?>" <?php selected( $selected, $level ); ?>>
					<?php echo $label; ?>
				</option>

			<?php endforeach; ?>

		</select>

		<?php submit_button( $this->translations['filter'], 'button', 'filter_action', false );
	}