SQL & PL/SQL :: Query To Find Count Of Delimiter In Column Val?

Need a query to find the count of presence of delimiter "," in column VAL for below mentioned table.

Table:

CREATE TABLE N_B_S_1
(
NUM NUMBER,
VAL VARCHAR2(20)
)

Data:

INSERT INTO N_B_S_1 VALUES(1,'A,B,C');
INSERT INTO N_B_S_1 VALUES(2,'D');
INSERT INTO N_B_S_1 VALUES(3,'ER,NF,G,H,XK');
INSERT INTO N_B_S_1 VALUES(4,'LQW,MBV');
INSERT INTO N_B_S_1 VALUES(5,'KS,YJ,WE,RQ,PM');
COMMIT;

Required output:

num, count of delimiters
===== ===========
1 2
2 1
3 4
4 2
5 4