{"Tunnel_Length":"51-100","Frequency":20,"Tunnel_Depth":"< =10","Frequency.1":4}
{"Tunnel_Length":"101-150","Frequency":17,"Tunnel_Depth":"10-30","Frequency.1":6}
{"Tunnel_Length":"151-200","Frequency":25,"Tunnel_Depth":"30-50","Frequency.1":16}
{"Tunnel_Length":"201-250","Frequency":10,"Tunnel_Depth":"51-70","Frequency.1":27}
{"Tunnel_Length":"250-300","Frequency":7,"Tunnel_Depth":"71-90","Frequency.1":23}
{"Tunnel_Length":">301","Frequency":4,"Tunnel_Depth":"91-110","Frequency.1":7}