Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode title | Subject | Music by | Lyrics by | Performed by | First aired |
| --- | --- | --- | --- | --- | --- |
| Conjunction Junction | conjunction | Bob Dorough | Jack Sheldon and Terri Morel | Jack Sheldon | 1973 |
| Unpack Your Adjectives | adjective | George R. Newall | George R. Newall | Blossom Dearie | 1975 |
| Lolly, Lolly, Lolly, Get Your Adverbs Here | adverb | Bob Dorough | Bob Dorough | Bob Dorough | 1974 |
| Interjections! | interjection | Lynn Ahrens | Lynn Ahrens | Essra Mohawk | 1974 |
| Rufus Xavier Sarsaparilla | pronoun | Bob Dorough | Kathy Mandary | Jack Sheldon | 1977 |
| Verb: That's What's Happenin' | verb | Bob Dorough | Bob Dorough | Zachary Sanders | 1974 |
| A Noun Is A Person, Place Or Thing | noun | Lynn Ahrens | Lynn Ahrens | Lynn Ahrens | 1973 |
| Busy Prepositions | preposition | Bob Dorough | Bob Dorough | Jack Sheldon and Bob Dorough | October 1993 |
Question:
When zachary sanders is the performer how many first aired are there?
Answer:
1.0