Custom Field not showing code

Hello,

i would like to add a custom field to the general settings page of wordpress for inserting google tag manager code:

add_filter(‘admin_init’, ‘my_general_settings_register_fields’);

function my_general_settings_register_fields()
{
register_setting(‘general’, ‘google-tag-manager’, ‘esc_attr’);
add_settings_field(‘google-tag-manager’, ‘<label for=”google-tag-manager”>’.__(‘Google Tag Manager’ , ‘google-tag-manager’ ).'</label>’ , ‘my_general_settings_fields_html’, ‘general’);
}

function my_general_settings_fields_html()
{
$value = get_option( ‘google-tag-manager’, ” );
echo ‘<input type=”text” id=”google-tag-manager” name=”google-tag-manager” value=”‘ . $value . ‘” />’;
}

I use

<?php echo get_option(‘google-tag-manager’); ?>

in the template for displaying. it’s working, but on instering code into the textfield it returns:

& lt;!– Google Tag Manager –& gt;

so the script code isn’t shown correctly…”<” becomes “& lt;” for example.

Can you help me to solve this problem