public function save_tax_rates() {
		global $wpdb;

		$current_class    = sanitize_title( $this->get_current_tax_class() );
		$posted_countries = wc_clean( wp_unslash( $_POST['tax_rate_country'] ) );

		// get the tax rate id of the first submited row.
		$first_tax_rate_id = key( $posted_countries );

		// get the order position of the first tax rate id.
		$tax_rate_order = absint( $wpdb->get_var( $wpdb->prepare( "SELECT tax_rate_order FROM {$wpdb->prefix}woocommerce_tax_rates WHERE tax_rate_id = %s", $first_tax_rate_id ) ) );

		$index = isset( $tax_rate_order ) ? $tax_rate_order : 0;

		// Loop posted fields.
		foreach ( $posted_countries as $key => $value ) {
			$mode     = ( 0 === strpos( $key, 'new-' ) ) ? 'insert' : 'update';
			$tax_rate = $this->get_posted_tax_rate( $key, $index ++, $current_class );

			if ( 'insert' === $mode ) {
				$tax_rate_id = WC_Tax::_insert_tax_rate( $tax_rate );
			} elseif ( 1 === absint( $_POST['remove_tax_rate'][ $key ] ) ) {
				$tax_rate_id = absint( $key );
				WC_Tax::_delete_tax_rate( $tax_rate_id );
				continue;
			} else {
				$tax_rate_id = absint( $key );
				WC_Tax::_update_tax_rate( $tax_rate_id, $tax_rate );
			}

			if ( isset( $_POST['tax_rate_postcode'][ $key ] ) ) {
				WC_Tax::_update_tax_rate_postcodes( $tax_rate_id, wc_clean( wp_unslash( $_POST['tax_rate_postcode'][ $key ] ) ) );
			}
			if ( isset( $_POST['tax_rate_city'][ $key ] ) ) {
				WC_Tax::_update_tax_rate_cities( $tax_rate_id, wc_clean( wp_unslash( $_POST['tax_rate_city'][ $key ] ) ) );
			}
		}
	}